US3981247A - Track working machine with vibratory and reciprocable track working tools - Google Patents

Track working machine with vibratory and reciprocable track working tools Download PDF

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Publication number
US3981247A
US3981247A US05/561,115 US56111575A US3981247A US 3981247 A US3981247 A US 3981247A US 56111575 A US56111575 A US 56111575A US 3981247 A US3981247 A US 3981247A
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Prior art keywords
hydraulic
hydraulic fluid
pulsating
control
tools
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Expired - Lifetime
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US05/561,115
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English (en)
Inventor
Josef Theurer
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Franz Plasser Bahnbaumaschinen Industrie GmbH
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Franz Plasser Bahnbaumaschinen Industrie GmbH
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B27/00—Placing, renewing, working, cleaning, or taking-up the ballast, with or without concurrent work on the track; Devices therefor; Packing sleepers
    • E01B27/12—Packing sleepers, with or without concurrent work on the track; Compacting track-carrying ballast
    • E01B27/13—Packing sleepers, with or without concurrent work on the track
    • E01B27/16—Sleeper-tamping machines

Definitions

  • the present invention relates to a track working machine comprising reciprocable and vibratory tools for working the track, and more particularly to a mobile track tamper comprising a frame mounted for mobility of the track and having reciprocable and vibratory tamping tools mounted thereon for tamping ballast.
  • a mobile track tamper comprising a frame mounted for mobility of the track and having reciprocable and vibratory tamping tools mounted thereon for tamping ballast.
  • the hydraulic motor means including a hydraulic motor associated with each tool for reciprocating the same, and a hydraulic circuit including a hydraulic fluid sump, a pump for delivering hydraulic fluid from the sump to the hydraulic motor means and return conduit means for returning hydraulic fluid to the sump.
  • ballast such as ballast of different particle sizes, degree of compaction of encrustation, as well as differences in required track corrections. For instance, it may be advantageous vigorously to vibrate the ballast during tamping when the ballast is heavily encrusted. Also, differences in the lifting stroke during track leveling cause different amount of ballast to be tamped under the ties of the leveled track, and only a change in the tamping force will provide a uniformly good support for the leveled track under such conditions. These operating conditions may change during maintenance work from tie to tie but also from track section to track section to be surfaced in a continuous operation along a stretch of track.
  • the above and other objects are accomplished in accordance with the invention with a control in the hydraulic circuit for generating a pulsating stream of the hydraulic fluid and delivering the pulsating stream to the hydraulic motor means whereby the tools are vibrated.
  • the control includes an impulse generator for imparting impulses to the hydraulic fluid and thereby generating the pulsating hydraulic fluid stream, and a valve assembly including a plurality of check valves and having inlet means and outlet means.
  • Control conduit means deliver the pulsating hydraulic fluid stream to the inlet means of the valve assembly
  • further conduit means deliver the pulsating hydraulic fluid stream from the outlet means of the valve assembly to respective chambers defined by the hydraulic motor means for reciprocating and vibrating the tools, and respective ones of the valves alternately block and permit passage of the pulsating hydraulic fluid stream from the inlet to the outlet means of the valve assembly.
  • the vibration control is dependably and rapidly responsive to almost all operating and track conditions for optimal track work efficiency.
  • Very high vibration frequencies may be obtained since the friction losses in the hydraulic medium are minimal.
  • the hydraulic fluid flow is controlled in pulses and remains unidirectional, i.e. it is never reversed, which fundamentally increases the responsiveness of the system, the use of a valve assembly being very advantageous because of its responsiveness.
  • the control also obviates or at least considerably reduces harmonic vibrations.
  • the impulse generator is a hydraulic pump, preferably a rotary piston pump whose opposed pistons are connected with their respective pressure outlets to control conduits leading to the valve assembly.
  • the hydraulic motors means may consist of a hydraulic motor associated with each tool for reciprocating the same, in which case the control is connected to the chambers of thee hydraulic motors for reciprocating and vibrating the tools. This enables the operator of a track tamper to control the vibration of a reciprocating tamping tool readily where the tool encounters a particularly encrusted ballast portion.
  • the hydraulic motor means may also include a further hydraulic motor to which the control is connected, in which case the hydraulic motor associated with each tool is connected to the further hydraulic motor for vibration of the hydraulic motor and the tool associated therewith while the hydraulic motor is used solely for reciprocation of the tool. This makes it possible, in case the control is used for a double-tie tamping unit, to change the tool reciprocating pressure of one of the pairs of tools of the unit while operating all the tools at the same vibration frequency and amplitude.
  • FIG. 1 is a schematic side elevational view of a mobile track tamper incorporating a control for the vibration and reciprocation of the tamping tools in accordance with this invention
  • FIG. 2 is a simplified circuit diagram showing the structure and operation of the control.
  • FIG. 1 there is shown a track working apparatus constituted by mobile track tamper 1 whose frame 2 has undercarriages moving on the track rails in an operating direction indicated by a horizontal arrow.
  • An overhanging front portion of the machine frame extends beyond the front undercarriage of tamper 1 and has mounted thereon tamping unit 3 comprising a vertically movable tamping tool carrier supporting a pair of tamping tools 4 (or two adjacent pairs of tamping tools, as indicated in broken lines in FIG. 1).
  • the tamping tools of each pair are reciprocable in the direction of track elongation for tamping ballast under each tie of the track when the tamping tool carrier is lowered to immerse the tamping tool jaws in the ballast.
  • Reciprocation of the tamping tools is effected by hydraulic motors 5 each consisting of a cylinder part and a piston rod part, one of the motor parts being linked to the tamping tool carrier while the other motor part is linked to an upper end of the tamping tool.
  • Two such transversely aligned pairs of tamping tools are associated with each track rail on either side of the rail so as to tamp the ballast properly under each point of intersection between tie and rail.
  • track lifting means 35 is mounted at the front of the machine frame for correcting the track position in respect of a reference system (not shown).
  • the track tamper of FIG. 1 is a conventional track working apparatus illustrated merely by way of example, such machines being more fully descirbed and illustrated, for instance, in U.S. Pat. Nos. 3,372,651, dated Mar. 12, 1968, 3,381,625, dated May 7, 1968, and 3,545,384, dated Dec. 8, 1970. These patents are merely illustrative, a great many similar or different track working machines, track tampers, track liners, and track leveling machines, being widely known. The specific type of track working apparatus forms no part of the invention.
  • storage tank 6 for hydraulic fluid is mounted on machine frame 2, the hydraulic circuit for operating tamping tools 4 including constant speed pump 7 whose input is connected to hydraulic fluid sump 6 by means of suction conduit 28 and whose output is connected to control 8 of the present invention by means of delivery conduit 29.
  • the control converts the flow of hydraulic fluid coming from pump 7 into at least one pulsating stream of hydraulic fluid for imparting vibrations to tamping tools 4.
  • control 8 is connected to operator's console 9 for operation by an operator at the console, the interconnection between pump 7, control 8 and hydraulic motors 5 being schematically illustrated in FIG. 2.
  • hydraulic fluid delivery conduit 29 is shown connected to the input of hydraulic motor 11 which drives impulse generator 12 for converting the hydraulic fluid flow into a pulsating stream.
  • Speed control valve 24 is mounted in delivery conduit 29 to meter the hydraulic fluid flow in conduit 29 in correspondence to the desired speed of motor 11 which, in turn, controls the frequency of the impulse generator.
  • Pressure relief valve 34 is mounted in hydraulic fluid return conduit 31" to return any excess hydraulic fluid to sump 6, as may be required by the setting of speed control valve 24.
  • the impulse generator has been illustrated herein in a preferred embodiment as a rotary piston pump which is affixed to motor 11 and whose piston means is rotated thereby at a speed set by valve 24.
  • An axially reciprocating piston pump or any equivalent impulse generator may be used instead of the illustrated rotary piston pump.
  • rotary piston pump 12 has an input in direct communication with hydraulic fluid sump 6 by means of suction conduit 30.
  • Two diametrically opposite outputs of pump 12 are connected respectively to hydraulic fluid control conduits 13 and 14.
  • the pump may have an adapter defining annular bores interconnecting the pressure outputs of pairs of oppositely positioned pistons to the control conduits.
  • Control 8 comprises valve assembly or block 15 whose inlets 25, 25 are connected to delivery conduit 36 to deliver hydraulic fluid from impulse generator 12 continuously to the valve assembly.
  • the valve assembly comprises two groups of valves, each group consisting of a pair of check valves 16, 17 and 18, 19.
  • One group of check valves 16, 17 is connected via conduit 33 to cylinder chambers 21 of the two hydraulic motors 5 for reciprocation of the tamping tools of each pair of tools while the other group of check valves 18, 19 is connected via conduit 32 to cylinder chambers 20 of motors 5.
  • the check valves of valve block 15 may be controllable non-return valves, computerized valves and equivalent valve means, each check valve having a control connection for blocking the valve and two operating connections.
  • control connections of check valves 16 and 18 are respectively connected by branch line 13' to control conduit 13 and by branch line 14' to control conduit 14 while the two operating connections of these valves are respectively connected to sump 6 by return conduits 31 and 31' and through outlets in valve block 15 to cylinder chambers 21 and 20 by branch lines 33' and 32'.
  • control connections of check valves 17 and 19 are respectively connected to control conduits 14 and 13 so that the check valves of each group are controlled by the control conduits connected to the outputs of impulse generator 12.
  • the two operating connections of these valves are respectively connected to hydraulic fluid delivery conduit 36 coming from impulse generator 112 and, via branch lines 32' and 33' to cylinder chambers 20 and 21.
  • Pump 7 which may be operated by the main drive of machine 1 or any other suitable power source, delivers a hydraulic pressure controlled by valve 24 to motor 11 to impart a desired speed to rotary piston pump 12.
  • Each rotation of the pistons of pump 12 causes the pistons to suck in a certain amount of hydraulic fluid delivered from sump 6 and to deliver this amount of hydraulic fluid into control conduits 13 and 14.
  • the pistons associated with one of the control conduits, for instance conduit 14 will be in a suction position while the pistons associated with the other control conduit, for instance conduit 13, will be in a pressure position.
  • impulse generator 12 will produce alternating impulses or chains of impulses in the hydraulic fluid flow to provide pulsating streams of hydraulic fluid in control conduits 13 and 14, the extent and duration of each impulse or chain of impulses being controlled by the speed of motor 11, i.e. speed control valve 24.
  • valves 17, 18 are blocked and valves 16, 19 are open so that hydraulic fluid is delivered to cylinder chambers 20 and displaced hydraulic fluid from cylinder chambers 21 is returned to the sump through conduits 33, 33' and 31. This causes a reverse movement of the tamping tools.
  • check valves 17 and 19 enable cylinder chambers 20 or 21 to receive hydraulic fluid from delivery conduit 36 which continuously receives a flow of hydraulic fluid from pump 12 and delivers it to inlets 25, 25 of valve assemby 15.
  • This pulsating stream of hydraulic fluid causes the tamping tools to be vibrated, the frequency as well as the amplitude of the tamping tool vibrations being controlled by the rotary speed of pump 12 which, in turn, is set by speed control valve 24.
  • additional conduit 26 is used for the reciprocation of the tamping tools through their tamping stroke.
  • branch conduits 26' and 26" are respectively connected to conduits 33 and 32 leading to cylinder chambers 21 and 20, a multi-way valve means 22 being interposed between additional delivery conduit 26 and the branch conduits.
  • Valve means 22 is manually or automatically controlled to deliver hydraulic fluid to a selected pair of cylinder chambers and to permit return of displaced hydraulic fluid from the other pair of cylinder chambers through open check valves 16 or 18.
  • one-way valves mounted in additional delivery conduit 26 and branch conduits 26', 26" permit only unidirectional flow of hydraulic fluid through these conduits from pump 23 to the inlets of valve block 15 and/or cylinder chambers 20, 21, and from conduit 26 to valve means 22. Excessive pressure is relieved through a pressure relief valve forming part of valve means 22 and permitting excess hydraulic fluid to be returned to sump 6 through return conduit 31'.
  • the one-way valves in conduit 36, which continuously delivers hydraulic fluid to the inlets of valve block 15, and in additional delivery conduit 26 serve properly to separate the hydraulic fluid deliveries from impulse generator pump 12 and constant speed pump 23.
  • FIG. 1 indicates that the control may instead be connected to a separate hydraulic motor 10 for imparting vibrations to the tamping tools, i.e. conduits 26', 26" would lead directly to the cylinder chambers of motors 5 for reciprocation of the tamping tools, while conduits 32 and 33 would lead from valve block 15 to the chambers of hydraulic motor 10.
  • the flow of hydraulic fluid through valve means 22 would be controlled from operator's console 9 to reciprocate the tamping tools.
  • Vibration of the tamping tools would be effected through motor 10, motors 5 associated with one of the tamping tools of each pair being connected with the cylinder of motor 10 while motors 5 associated with the other tamping tools of each pair are respectively connected with opposite ends of the piston rod extending from the cylinder of motor 10 and reciprocating therein under the control of impulse generator 12.
  • vibration control 8 may advantageously be mounted directly on the vertically adjustable tamping tool carrier of tamping unit 3. This enablves the connections between valve assembly 15 of control 8 and cylinder chambers 20, 21 of motors 5 or of motor 10, if the latter is used for vibration control, to be considerably shortened. This is particularly useful because it is preferred to use pipes for conveying the pulsating streams of hydraulic fluid and this arrangement makes it possible to use short pipes. If connecting hoses are used, the elasticity of the hoses may dampen the pulsations of the hydraulic fluid and thus reduce the efficiency of the vibration system. It is, therefore, preferred to use pipes at least in this portion of the control.
  • Reciprocation of the tamping tools by operation of valve means 22 and vibration thereof by operation of speed control valve 24 as well as flow metering valve 27 are most simply controlled from operator's console 9 mounted on machine frame 2.
  • the vibration control of the present invention is not limited to the specifically described and illustrated embodiment.
  • the illustrated hydraulic impulse generator could be replaced by any suitable impulse generating means for converting a continuous flow of fluid into a pulsating stream, such as an impulse generator actuated by mechanical, electrical or compressed air means, such as a pneumatic motor, with the use of an eccentric shaft for imparting vibrations to the tools.
  • the vibration control may be used on ballast tampers operating with synchronously or asynchronously reciprocable pairs of tamping tools, as well as single tamping tools reciprocable in relation to one side of a tie only.
  • track lining tools or any other track working tools which are desired to be vibrated during operation may be vibrated by the control of this invention.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Machines For Laying And Maintaining Railways (AREA)
  • Fluid-Pressure Circuits (AREA)
US05/561,115 1974-05-09 1975-03-24 Track working machine with vibratory and reciprocable track working tools Expired - Lifetime US3981247A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT385574A AT339358B (de) 1974-05-09 1974-05-09 Antriebs- und steuereinrichtung fur vibrier- und verstellbare werkzeuge einer gleisbearbeitungsmaschine, insbesondere fahrbare gleisstopfmaschine
OE3855/74 1974-05-09

Publications (1)

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US3981247A true US3981247A (en) 1976-09-21

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US05/561,115 Expired - Lifetime US3981247A (en) 1974-05-09 1975-03-24 Track working machine with vibratory and reciprocable track working tools

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US (1) US3981247A (xx)
JP (2) JPS50154906A (xx)
AT (1) AT339358B (xx)
BG (1) BG25237A3 (xx)
CH (1) CH589176A5 (xx)
DD (1) DD117500A5 (xx)
DE (1) DE2507020C2 (xx)
FR (1) FR2270377B1 (xx)
GB (1) GB1485548A (xx)
SU (1) SU629896A3 (xx)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4068595A (en) * 1975-11-17 1978-01-17 Graystone Corporation Track tamper
US4088077A (en) * 1976-03-15 1978-05-09 Canron, Inc. Continuous tamping device
US4096806A (en) * 1975-11-17 1978-06-27 Graystone Corporation Track tamper with hingeable unitary pivotable tamping unit
US5046430A (en) * 1988-06-24 1991-09-10 Kaluzhskoe Proizvodstvennoe Obiedinenie Putevykh Mashin I Gidrapriuodok "Kalugaputmash" Tamping mechanism of tie-tamping outfit
US5664633A (en) * 1995-09-04 1997-09-09 Franz Plasser Bahnbaumaschinen-Industriegesellschaft M.B.H. Machine for treating a ballast bed
US20130277987A1 (en) * 2010-02-22 2013-10-24 Alfredo Manuel Cardenas Riojas Electrical energy microgenerator with magnetic coupling
US20180202113A1 (en) * 2015-08-21 2018-07-19 Plasser & Theurer Export Von Bahnbaumaschinen Gesellschaft M.B.H. Tamping unit
US20180274178A1 (en) * 2015-11-18 2018-09-27 Plasser & Theurer Export Von Bahnbaumaschinen Gesellschaft M.B.H. Tamping unit and method for tamping a track
US10100469B2 (en) * 2014-12-22 2018-10-16 Hp3 Real Gmbh Tamping assembly for a track tamping machine
US10208432B2 (en) * 2014-10-17 2019-02-19 Plasser & Theurer Export Von Bahnbaumaschinen Gesellschaft M.B.H. Tamping unit for tamping sleepers of a track
US10421101B2 (en) 2015-02-27 2019-09-24 Plasser & Theurer Export Von Bahnbaumaschinen Gesellschaft M.B.H. Tamping unit for tamping sleepers of a track
CN110809654A (zh) * 2017-07-04 2020-02-18 普拉塞-陶伊尔铁路机械出口股份有限公司 用于压实轨道道碴床的方法和装置
US20210010206A1 (en) * 2018-01-22 2021-01-14 Hp3 Real Gmbh Tamping assembly for a track tamping machine
CN112977456A (zh) * 2021-04-25 2021-06-18 潍柴动力股份有限公司 履带行走车辆控制方法、装置及静压驱动履带行走车辆
US11053644B2 (en) * 2016-11-25 2021-07-06 Piasser & Theurer Export von Bahnbaumaschinen Gesellschaft m.b.H. Tamping unit for tamping sleepers of a track
US11072891B2 (en) * 2016-01-21 2021-07-27 Matisa Materiel Industriel S.A. Tamping machine with synchronized hydraulic motors
US11821147B2 (en) 2017-05-29 2023-11-21 Plasser & Theurer Export Von Bahnbaumaschinen Gmbh Method and device for compaction of a track ballast bed

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH668093A5 (de) * 1984-10-30 1988-11-30 Plasser Bahnbaumasch Franz Gleisstopfaggregat einer gleisstopfmaschine.
IT1219091B (it) * 1988-03-09 1990-04-24 So Re Ma Operatrici Ferroviari Macchina rincalzatrice perfezionata particolarmente per la rigenerazione di massicciate ferroviarie
AT513973B1 (de) 2013-02-22 2014-09-15 System7 Railsupport Gmbh Stopfaggregat für eine Gleisstopfmaschine
AT518025A1 (de) 2015-12-10 2017-06-15 Plasser & Theurer Export Von Bahnbaumaschinen Gmbh Stopfaggregat und Verfahren zum Unterstopfen eines Gleises
AT518072B1 (de) 2016-04-29 2017-07-15 Hp3 Real Gmbh Stopfaggregat für eine Gleisstopfmaschine
AT520117B1 (de) 2017-07-11 2019-11-15 Hp3 Real Gmbh Verfahren zum Verdichten eines Schotterbettes eines Gleises
DE102018205821A1 (de) * 2018-04-17 2019-10-17 Robert Bosch Gmbh Vibrationsantreiben mit einem Mehrflächenzylinder
AT524861B1 (de) 2021-04-12 2022-10-15 Plasser & Theurer Export Von Bahnbaumaschinen Gmbh Verfahren und Maschine zum Stopfen eines Gleises

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB956486A (en) * 1961-08-09 1964-04-29 Mcconnel F W Ltd Improvements in or relating to fluid pressure operated reciprocating systems
US3669025A (en) * 1969-08-08 1972-06-13 Plasser Bahnbaumasch Franz Tamper unit for mobile track tamping machine
US3810417A (en) * 1972-01-31 1974-05-14 H Sieke Method and apparatus for producing vibratory motion
US3885883A (en) * 1972-03-21 1975-05-27 Helmut Sieke Method and apparatus for compacting earth, sand, gravel, ballast and similar materials

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT303106B (de) * 1970-04-17 1972-11-10 Plasser Bahnbaumasch Franz Gleisbaumaschine
DE2120045C3 (de) * 1971-04-23 1981-03-19 Sieke, Helmut, Dipl.-Ing., 6200 Wiesbaden Vorrichtung zur Erzeugung von Schwingungen mit einem hydraulischen Arbeitszylinder
AT319993B (de) * 1971-07-14 1975-01-27 Plasser Bahnbaumasch Franz Fahrbare Gleisnivellier-Stopfmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB956486A (en) * 1961-08-09 1964-04-29 Mcconnel F W Ltd Improvements in or relating to fluid pressure operated reciprocating systems
US3669025A (en) * 1969-08-08 1972-06-13 Plasser Bahnbaumasch Franz Tamper unit for mobile track tamping machine
US3810417A (en) * 1972-01-31 1974-05-14 H Sieke Method and apparatus for producing vibratory motion
US3885883A (en) * 1972-03-21 1975-05-27 Helmut Sieke Method and apparatus for compacting earth, sand, gravel, ballast and similar materials

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4096806A (en) * 1975-11-17 1978-06-27 Graystone Corporation Track tamper with hingeable unitary pivotable tamping unit
US4068595A (en) * 1975-11-17 1978-01-17 Graystone Corporation Track tamper
US4088077A (en) * 1976-03-15 1978-05-09 Canron, Inc. Continuous tamping device
US5046430A (en) * 1988-06-24 1991-09-10 Kaluzhskoe Proizvodstvennoe Obiedinenie Putevykh Mashin I Gidrapriuodok "Kalugaputmash" Tamping mechanism of tie-tamping outfit
US5664633A (en) * 1995-09-04 1997-09-09 Franz Plasser Bahnbaumaschinen-Industriegesellschaft M.B.H. Machine for treating a ballast bed
US20130277987A1 (en) * 2010-02-22 2013-10-24 Alfredo Manuel Cardenas Riojas Electrical energy microgenerator with magnetic coupling
US9124197B2 (en) * 2010-02-22 2015-09-01 Alfredo Manuel Cardenas Riojas Electrical energy microgenerator with magnetic coupling
US10208432B2 (en) * 2014-10-17 2019-02-19 Plasser & Theurer Export Von Bahnbaumaschinen Gesellschaft M.B.H. Tamping unit for tamping sleepers of a track
US10100469B2 (en) * 2014-12-22 2018-10-16 Hp3 Real Gmbh Tamping assembly for a track tamping machine
US10421101B2 (en) 2015-02-27 2019-09-24 Plasser & Theurer Export Von Bahnbaumaschinen Gesellschaft M.B.H. Tamping unit for tamping sleepers of a track
US10563358B2 (en) * 2015-08-21 2020-02-18 Plassser & Theurer Export Von Bahnbaumaschinen Gesellschaft M.B.H. Tamping unit
US20180202113A1 (en) * 2015-08-21 2018-07-19 Plasser & Theurer Export Von Bahnbaumaschinen Gesellschaft M.B.H. Tamping unit
US20180274178A1 (en) * 2015-11-18 2018-09-27 Plasser & Theurer Export Von Bahnbaumaschinen Gesellschaft M.B.H. Tamping unit and method for tamping a track
US10633801B2 (en) * 2015-11-18 2020-04-28 Plasser & Theurer Export Von Bahnbaumaschinen Gesellschaft M.B.H. Tamping unit and method for tamping a track
US11072891B2 (en) * 2016-01-21 2021-07-27 Matisa Materiel Industriel S.A. Tamping machine with synchronized hydraulic motors
US11053644B2 (en) * 2016-11-25 2021-07-06 Piasser & Theurer Export von Bahnbaumaschinen Gesellschaft m.b.H. Tamping unit for tamping sleepers of a track
US11821147B2 (en) 2017-05-29 2023-11-21 Plasser & Theurer Export Von Bahnbaumaschinen Gmbh Method and device for compaction of a track ballast bed
CN110809654A (zh) * 2017-07-04 2020-02-18 普拉塞-陶伊尔铁路机械出口股份有限公司 用于压实轨道道碴床的方法和装置
CN110809654B (zh) * 2017-07-04 2022-03-22 普拉塞-陶伊尔铁路机械出口股份有限公司 用于压实轨道道碴床的方法和装置
US11542666B2 (en) * 2017-07-04 2023-01-03 Plasser & Theurer Export Von Bahnbaumaschinen Gesellschaft M.B.H. Method and device for compacting a track ballast bed
US20210010206A1 (en) * 2018-01-22 2021-01-14 Hp3 Real Gmbh Tamping assembly for a track tamping machine
US11713547B2 (en) * 2018-01-22 2023-08-01 Hp3 Real Gmbh Tamping assembly for a track tamping machine
CN112977456A (zh) * 2021-04-25 2021-06-18 潍柴动力股份有限公司 履带行走车辆控制方法、装置及静压驱动履带行走车辆
CN112977456B (zh) * 2021-04-25 2022-07-19 潍柴动力股份有限公司 履带行走车辆控制方法、装置及静压驱动履带行走车辆

Also Published As

Publication number Publication date
CH589176A5 (xx) 1977-06-30
BG25237A3 (en) 1978-08-10
JPS5984001U (ja) 1984-06-06
JPS50154906A (xx) 1975-12-13
JPS6123044Y2 (xx) 1986-07-10
DD117500A5 (xx) 1976-01-12
FR2270377B1 (xx) 1979-08-03
FR2270377A1 (xx) 1975-12-05
DE2507020A1 (de) 1975-11-27
GB1485548A (en) 1977-09-14
DE2507020C2 (de) 1985-10-24
AT339358B (de) 1977-10-10
ATA385574A (de) 1977-02-15
SU629896A3 (ru) 1978-10-25

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